Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Excellent gag (3-7)
  2. 7a Person who remains doubtful (8)
  3. 8a Delight (4)
  4. 9a System of exercises to promote control of body and mind (4)
  5. 10a Lack (of) (7)
  6. 12a Happy-go-lucky — a rum car hums (anag) (5-6)
  7. 14a Fickle (7)
  8. 16a Lacking sensation (4)
  9. 19a Pulse (4)
  10. 20a Party acting game (8)
  11. 21a Over fastidious (10)
  12. 1d Game where forward passes are illegal (5)
  13. 2d Internet commentator (7)
  14. 3d Taking lively interest in (4)
  15. 4d Bribe (8)
  16. 5d Bird of prey with broad wings (5)
  17. 6d Digital filming device for putting images on the internet (6)
  18. 11d Symbol expressing feelings — to come in (anag) (8)
  19. 12d Shout out loudly (informal) (6)
  20. 13d Food cooked or served in a roll (7)
  21. 15d Bottled spirit? (5)
  22. 17d Smelling of bitter? (5)
  23. 18d Of those who aren't clergy (4)